Not Sleeping

What exactly does not sleeping enough do to the baby?
- I'm 16w4d, work full time nights, have 3 other kids (that have their various activities) and go to school part time (online, usually at work lol) I feel like I don't eat enough & I'm sure I don't sleep enough. My husband is in school full time in a city an hour away, so he helps when he can but isn't around too much. 
I'm working out meal plans so I make sure I eat properly, (now that I CAN eat and I'm not living off only grilled cheese..) but I'm not sure how to squeeze in more sleep.. I just wondering what lack of sleep does to baby..
If nobody has any dr appts or activities I get roughly 6 hours of sleep the morning after I work, but if anything needs to be done.. Dr appts, school functions, school holidays etc.. I have to lose sleep.